Computes a beat spectrum — beatSpectrum • sonicscrewdriver

Beat spectra represent the periodicity in signal amplitude. It is computed by performing a continuous wavelet transform on the envelope of a preprocessed signal, and processing the average power per frequency band.

Usage

beatSpectrum(wave, min_period = 0.005, max_period = 30, dj = 1/32, ...)

Arguments

wave: an R object or path to a wave file
min_period: the minimal rythmicity period expected, in seconds
max_period: the maximal rythmicity period expected, in seconds
dj: the frequency resolution of the cwt (in voices per octave)
...: extra arguments passed to analyze.wavelet()

Value

a spectrum as a data frame. It contains two columns: power and period. The number of rows depend on the resolution and frequency range.

Author

Quentin Geissmann

Examples

if (FALSE) { # \dontrun{
beatSpectrum(sheep)
beatSpectrum(sheep, min_period=0.005, max_period=30, dj=1/32)
} # }